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  1. EICO HF86 scratch build question please
  2. what to do with a 12W 600ohm to 4/8 ohm output transformer?
  3. Telewatt VS71M
  4. Yamamoto 09S 300B SE Amp Problem
  5. Marantz-9
  6. 6V6 amp question
  7. Wood chassis
  8. My first project SE(T) into high end audio.
  9. Supermalloy for the Power transformer?
  10. Can I build a screen reg. with IXYS 10M45?
  11. Modified DynacoMkIV
  12. Refurbising Conrad Johnson Premier One
  13. Would using a 16ohm speaker damage my SE output transformers?
  14. Grommes/PE S-35 questions
  15. Concertina phase inverter with LED bias - is this completely wrong?
  16. Parafeed turn-on delay
  17. I'm looking for 6an8 (as V1) schematics
  18. New Project - EL84 PP and preamp - suggestions welcome
  19. The sound of modern transformers compared with vintage gear
  20. Determining the core cross sectional area, Afe, for SE OPT
  21. HT power supply high?
  22. under-run push pull
  23. 12B4 Linestage Woes
  24. Transcendent Sound Mini-Beast
  25. A Question About Positive Feedback
  26. Help with opera consonance M100plus
  27. Just received 2x PT Choke OT. best implementation ?
  28. Just received 2x PT Choke OT. best implementation ?
  29. Mystery Valve ID
  30. Oddball OT with extra secondary winding
  31. Help with Multi Section Can Cap replacement
  32. 600V bench variable supply to test transmitting valves
  33. Heater-cathode voltage spec interpretation
  34. Tell me why this wont work.
  35. headphone amp for Senns HD600
  36. Transformer orientation and suggestions.
  37. 12AU7 stereo SE mini-amp build!
  38. allen type 20a schematic
  39. 2010 lemon year for EH 6922 tubes
  40. Chinese GU50 PP
  41. Gain, Vpp and attenuation at each stage
  42. 6n14p headphone amp
  43. Heater Lifter
  44. KT88 & 6550 Pentode power output?
  45. Biasing Improved Williamson
  46. Lowering the Volume Control on Tube Amps
  47. Got the Hum out!! Thanks All
  48. How hot KT88 get? Anybody take a reading?
  49. Broskie Unbalancer
  50. Phase splitting transformer design
  51. Red plate KT88
  52. 6N16B preamp
  53. Eimac 450th nos
  54. how much clearance above tubes for KT88 enclosure
  55. Cathode preheating???
  56. RIAA Question - Power
  57. Linearity of Red RCA 5692
  58. What gauge enclosure for KT88 AMP?
  59. Output Transformer Issue???
  60. Maggie 8802 placement issue
  61. Can you recommend a tube tester?
  62. 6550 tube protection socket
  63. PT laminations are usable as OT laminations ?
  64. Are These Authentic Russian Military 1578 Vacuum Tubes?
  65. Amp ID Please
  66. Help for Main Transformer Spec for CCDA
  67. Switching SE and balanced inputs/outputs
  68. kt88 PP rectifier.
  69. How much Blue glow is ok?
  70. Recommendations on How To mono a pre amplifier?
  71. 6H6pi curves available?
  72. 1p24b
  73. help, Built from scratch Kalamazoo 2 noise
  74. 5CZ5/5BQ7A single ended amp
  75. Hopefully a simple question.
  76. 211 tube recommendations
  77. Need HELP with TUBE IMP
  78. Another unknown tube
  79. Triode Bias 101
  80. Bogen MO-200A transplant /conversion
  81. 5U4 o bridge rectifier
  82. Choosing the right transformer
  83. V-Cap Help
  84. Older tubes sound better
  85. 6J7 preamp
  86. Menygue mini/music angel amp
  87. Driving a Behringer INuke Nu1000
  88. cathode follower ecc88 on 60volt
  89. Docs for Heathkit AA-23?
  90. 45 tube amp schematic
  91. Old TO-R s15u, Should i fix it?
  92. Tube ID
  93. VTL driver tube question
  94. Fun with junk EL84 SE
  95. Enclosure ideas
  96. Burn in procedure for NOS necessary?
  97. Strange Lorenz ECC81 12AT7
  98. Amplifier first start up; Plays tone of signal generator with no speakers!
  99. Reports of the death of Audiophool have been greatly exaggerated
  100. help me identify some vintage tubes // need suggestions for possible applications!
  101. Lowering cost of audio output transformer
  102. Source for transformers in Europe
  103. morgan Jones HT caps & Anode Loads
  104. Tuning Negative feedback
  105. Hickok reference 6L6 for calibration..
  106. SET-NO FEEDBACK amplifier performance
  107. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  108. Console Amplifier Pull:Voltages over Spec
  109. Help! My EL34B based amp arced at full volume.
  110. MUZAK 50's tube amp
  111. Tube break-in?
  112. Custom power tranny specs recommendations for 300B pse monoblocs
  113. mosfet source follower output stage.
  114. Winter upgrade project - new heating unit
  115. 6KM8 amp
  116. Power and output transformers to ground.
  117. Help with this schematic? B+? B++?
  118. What to do with this old amp? suggestions please.
  119. DIY CAT SL1 preamp
  120. Phase inverter, your comments welcomed!
  121. Basic Bias Question for PP Amp
  122. Oddwatt 5751/6550
  123. Please help me to identify Telefunken PCC ...
  124. Modification of 300B SE Amplifier
  125. 300B Tube and Amp Questions
  126. ST70 "Imposter"
  127. cathode follower question
  128. marconi tubes....can someone idntify these
  129. DeathTrap400 : : A Pretty Damn Good 300B Amp
  130. SOS: First Build, Lots of Hum
  131. 1959 Silvertone Syntronic Can Capacitor question
  132. KR Audio Marconi R valve amp?
  133. Distortion
  134. Tung-Sol 6098/6AR6 Substitution
  135. Dropout in RTP3 phono stage
  136. Audio Research EC-3 modification
  137. 300b all-DHT SET
  138. My first tube project !
  139. Trouble with homebuilt amp
  140. Music angel el34b problem
  141. Elecrolytic capacitor reforming
  142. The end of tubes?
  143. Two stages EL34 power amplifier
  144. 7199 replacement in AMPEX 6973
  145. IT coupled tube-SS hybrid amp suggestion- needs development
  146. Original Cary CAD-300se upgrades?
  147. Convert Integrated Tube Preamp to an amplifier
  148. McCurdy AM405 Schematics
  149. Looking for Neumann N149 power supply schematic
  150. B&K model 747 tube tester for EL34
  151. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  152. I need datasheet of 8753 tube, help me!
  153. New 6L6GC Project. DC -> LTP
  154. EL84 in UL
  155. 1953 revere amp conversion
  156. Manley transformer specifications
  157. Recommended 300B SE Amplifier Designs
  158. Found a new interstage coupling method (?)
  159. Amplifier Distortion (Northern Electric)
  160. when do filament supplies need to be floated
  161. gm70 filiment transformers
  162. Replacing 6922 Preamp Tube in ARC LS7
  163. Please educate me: Tube testing, the life test, and Grid Leakage
  164. 6AR6 6098 Triode PP Load Line
  165. music reference rm5-4 schematics
  166. S5 K-12G output trans
  167. Transformer center tap question
  168. EF86 + 4*EL84PSE
  169. solid state relays for plate load switching?
  170. Dont have a power transformer?
  171. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  172. Pre-Amp For my Tubelab Simple P-P
  173. Power Transformer Help
  174. Analog Metric 2A3 PP Kit
  175. Good, starter OTL kit
  176. Dual SE amplifier? - (not PSE) - Take two!
  177. Mysterious SE OTL headphone amp from China?!
  178. Inv. Futterman with gain stages between PI and O/P?
  179. PSU configurations for tube amp
  180. HP Model 712b Regulated Power supply
  181. Dynaco low Power Amp
  182. 300b power suply
  183. Very Strange Preamp Issue
  184. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  185. tube transformer suppliers in Mercosur
  186. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  187. time delay sophia electric
  188. Twisting the leads of filter choke
  189. This SPUD's 4 U
  190. I am Looking for tubes
  191. Thuan
  192. Nanjing 6V6GT ( 6P6P)
  193. Should I keep this old stuff?
  194. 300b
  195. ganged output transformers
  196. Holco H4P Resistors, Should I use them?
  197. 6BX8 curves, help !
  198. SANSUI AU-70 or 1000A???
  199. General Electric YTW-1 Tube Checker
  200. Ground or amp hum-which?
  201. need help to fix the "hiss" on my tube preamp
  202. Best SE interstage 1:1 for min. 15mA?
  203. Dual Single Ended Amplifier? - (not PSE)
  204. RIP Forum Member "Ivey"
  205. valves to replace opamps in cd player
  206. Replacing capacitors on Audio Research D40 power amp.
  207. No sound and low B+?
  208. Replacing capacitors on Audio Research D40 power amp.
  209. 2 Channel Tube Amp and Sub Connection
  210. EZ125 Amp Project
  211. Yaqin MS-22b Phono Amp
  212. First post and a couple P.P. questions
  213. adding a preamp to tube power amp
  214. 6SN7 6N8S preamp suggestions
  215. 300b polarity
  216. Electrolytic capacitor vs extra triode stage
  217. WE JAN 274B Dating
  218. EICO 666 Tester Help
  219. Hickock 550X signal voltage
  220. First Headphone tube amp kit to build??
  221. Anyone owns a Dynavox VR-307 Amplifier ?
  222. NOS potted Chicago Transformer 1BC-150
  223. capacitor voltage for tube amp power supply
  224. 808 SE Design Help!
  225. Why can't I build my own ARC LS-5 or CJ PV-12?
  226. Post-mortem on a 80 year old 2A3 amp
  227. 6e5p gm70 with 6d22s?
  228. 6L6-6V6-EL34-KT88-6CA7-EL84
  229. Scheme for SE amp
  230. $16,000
  231. Hybrid power amp
  232. Diagnosis please
  233. BK 707 Tube Tester Mods
  234. monarch 614
  235. Separate Filament and B+ Switches
  236. Dynaco Low Power with 12AY7's
  237. PTP kits available?
  238. Which OP transformer and materials?
  239. Power of Tube Amp and Transistors Amp
  240. testing tubes
  241. current servo not voltage.
  242. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  243. 300b filament
  244. DHT SE auto bias circuit
  245. Anyone try swapping 6SN7 w/ 6F8G
  246. Eliminating Cathode Bypass Caps In SET Amplifier
  247. Nano vacuum tube
  248. Help High Line voltage
  249. Switchable Amp Output?
  250. PCB or hardwire?

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